Concrete sawing machine



April 26, 1960 w. H. LEWIS 2,934,327

' CONCRETE SAWING MACHINE Original Filed Dec. 23, 1950 2 Sheets-Sheet 1 INVENTOR. lmunn/fz/ksrlzw/s April 26, 1960 Original Filed Dec. 23, 1950 W. H. LEWIS CONCRETE SAWING MACHINE 2 Sheets-Sheet 2 I d 4 w 90 99 [0/ 97 98 95 56a.

1 ll 3 w I n 557 I I00 6 87 84' m2 5392'. .2 7 as l a=1' as I! I l l l I IN VEN TOR. I I MLL/AMIY /RsTLLW/s Arromvqx CONCRETE SAWING MACHINE William H. Lewis, Arcadia, Calif., assignor to Cutcrete Manufacturing Corp., El Monte, Calif., a corporation of California Continuation of application Serial No. 202,445, Decemher 23, 1950. This application April' 3, 1956, Serial No. 575,838

1 Claim. (Cl. 262-20) This is a continuation of application Serial No. 202,445, filed by me December 23, 1950 and bearing the same title which application was abandoned April 3, 1956.

This invention relates to road making machinery, and

more especially to a concrete cutting saw.

v concrete slabs such as roads, sidewalks, floors, and the like.

Another object of the invention is to provide in a concrete cutting saw machine improved adjustable main and guide wheel axles.

Another object of the invention is to provide in a concrete cutting saw machine a novel blade mounting which permits making a cut flush to a wall or curb.

Other objects and advantages will appear and be brought out more fully in the following specification, reference being had to the accompanying drawings where- 1n:

7 Figure 1 is a side elevation view of a concrete cutting machine showing a preferred embodiment of my invention;

Figure 2 is a front elevation view of the same; 7 Figure 3 is a reduced side elevation view of the machine as seen in Figure 1 showing the trailer hitch features of my invention;

Figure 4 is a partial sectional view taken along the line 44 of Figure 2;

Figure 5 is a reduced partial rear elevation view of the same;

Figure 6 is a side elevation view of a modified form of my invention; and

Figure 7 is a top plan view of the same.

Referring more particularly to Figures 1 to 5, I show a concrete cutting machine 10 having a a main frame or chassis '11, supported by front wheel assembly 12 having a pair of wheels 13 and a rear wheel assembly 14 having a pair of rear wheels 15. A base 16 is mounted on frame 11 and adjustably positioned as by one or more adjusting screws 17, and supports an internal combustion engine or other motor 20. I

A plate 21 is secured at an angle to the rear end of frame 11 and has bearing brackets 22 for a shaft 23 on which is a pulley 24 driven by a belt 25 from a pulley 26 on the drive shaft of engine or motor 20. Engine 20 has the usual auxiliary equipment such as a fuel tank 27, carburetor 28, and the like. A water tank 30 is secured in any suitable manner to the top of engine 20, and has a cooling water inlet to the engine, if of a water cooled type.

A pair of flanges 31 is secured on the top of engine 20 and a pair of rods 32 are secured to each flange 31 and extend forwardly and rearwardly somewhat inclined, as shown, and a handle bar unit 33 has a pair of tubular members 34 adapted to be secured either to the forward States Patent ce 2,934,327 Patented Apr.- 26, 1960 A front guide assembly 36 comprises a pair of rods 37 having inwardly bent ends 38* for engaging in holes in frame 11, a transverse tube 40 to which a guide tongue 41 is secured as by a welded connection and a pointer,

rod 42 adjustably carried by tube 40 and locked by a wing screw 43, or the like. 7 t

A circular concrete cutting saw blade 44 is secured on shaft 23, and an arcuate blade guard 45 is suitably attached to the side flange of frame 11. A sector shaped saw guard 46 is secured to fixed guard 45 by a suitable hinge 47 having a retractable bolt whereby this sector maybe removed entirely if desired. Guard sector 46 may be swung upwardly and over fixed guard 45, as shown in dotted outline in Figure 1 when it is desired to make a cut flush to a wall or curb.

A pipe or tube 50 is connected to water tank 30, and a valve 51 connects pipe 50 with a pipe 52 connected to a collar 53 mounted on blade guard 45. An L-shaped slotted tube 54 is secured to collar 53 by a lock screw 55, tube 54 having an elongated slot to direct a sheetlike stream of water from tank against the side of saw blade 44.

Rear wheel assembly 14 includes a pair of posts 56,

each extending upwardly from frame 11 through a pair of guide tubes 57 and 57a. Posts 56 I have bearing brackets for an axle 59 on which wheels 15 are mounted. A compression spring 58 (Figure 6) is positioned on a shaft 56a between axle 59 and a tubular extension 11a of frame 11 (Figure 7). Tube 57 extends through a slot 11b in frame 11 and is secured to a bracket 57b pivoted at 57c to frame 11. Bracket 57b may be secured against rotation by a suitable lock screw 57d. A lock screw 60 may be provided for either or both of tubes 57 for locking posts 56 at any position, and by this construction the depth of cut of saw blade 44 may be altered.

Front wheel assembly 12 comprises a vertical plate 61 having a horizontal flange 62 formed with a bearing aperture 63 to receive a pivot bolt 64 extending through frame 11, which permits plate 61 to swivel about the vertical axis of the bolt. A link 65 connects one end of plate 61 and the lower end of a lever 66 pivoted at 67 to frame 11. Plate 61 mounts a pair of horizontal tubes 70 and 71, tube 71 receiving and securing as by lock bolt '72 the axle 73 which carries one of the front wheels 13. Tube 70 similarly secures the inner offset end of an axle 74 which carries the other front wheel 13. It will be observed that tube 70 is positioned above tube 71"and this arrangement is such that axles 73 and 74 may extend substantially the length of plate 61 and permit adjustable spacing of wheels 13 a substantial amount when desired.

A pair of aligned sleeves 75 and 76 are secured to the under side of chassis 11 along the center line, and a tubular tow bar 77 is slidable into sleeves 75 and 76 and has a suitable trailer hitch connection 78 to a towing vehicle.

In Figures 6 and 7 I show a modification directed to structure for mounting an additional auxiliary saw blade. In these figures I show a main frame or chassis 11 similar to that shown in Figures 1 to 5, supporting a saw shaft 23:: and having a saw blade 44. An auxiliary saw frame 81 comprises a pair of L-section rail or plate members 82 having bearing connections 83 to shaft 23a and a pair of similar plates 84 having slot and bolt connections 85 and 86 with rails 82, and a transverse plate 87 connecting one end of rails 84. Plate 87 mounts bearings 88 for a saw blade shaft 90 having a saw blade 91 at one end and a pulley 92 at the other end, to be driven by belt 93 from a pulley 94 on saw shaft 23a,

An arcuate plate 95 having an open end slot 96 is suitably mounted on frame 11a. A link assembly 97 connected to plate 87 engages plate 95- and comprises a tube member 98 which receives one end of a rod 99 having a pivot connection 100 to plate 87. A stop collar 101 is adjustably vpositioned on rod 99 and seats one end of a compression spring 102, the other end of which engages one end of tube 98. Rod 99 has a radially extending pin. 103 in slot 104 in tube 98. A handle 105 has a shank connected to tube 98 and adapted to pass through slot 96, this slot being sufficiently wide to admit rod 99 when in adjusted position. By this construction, when saw blade 91 is in operative position, shaft 90 will be urged downwardly by the pressure of spring 87, hearing against tube 98 which is in engagement with the outer arcuate face of plate 95. When it is desired to move saw blade 91 from operative position, this may be accomplished by swinging frame 81 clockwise and lifting handle member 105 out of slot 96, and then effecting an engagement of plate 95 between turns of spring 102 with rod 99 extending through the slot, as shown in the dotted position of Figure 6.

The operation of the invention should be apparent from the foregoing description. Saw blade 44 is rotated on shaft 23 by the operation of engine or motor 20, and the depth of cut in a concrete slab or roadway is determined by the setting of tubes 57 on posts 56. With handle bar unit 33 as shown in full lines in Figure l, the machine can be pushed along a roadway or slab and a straight line, if marked, can be followed by keeping guide pointer rod 42 on such line. If this line should be curved or if it is desired to move the machine in a curve, or to correct for drift due to slope of the pavement, the'operator can, without changing his position, shift lever 66, thus rotating front wheel axle frame 61, as may be seen in Figure 4. During the operation of the saw, blade 44 may be cooled by a spray of water from tank 30 issuing from spray tube 54, or a continuous water supply may be provided by hose connection to pipe 50. If it is desired to reverse the cut from a trailing cut to a forward cut without turning the machine arotmd, this can be done readily by removing handle bar unit 33 from the rearwardly extending rods 32 and connecting the assembly to the forwardly extending rods 32, as indicated in the dotted outline in Figure 1. When operated with the blade forward and guard sector 46 up, blade 44 may be run flush up to a wall. When it is desired to move the machine to and from locations, the machine can be connected to a motor vehicle by the use of tow bar 77 and trailer hitch 78, and the machine tilted, as shown in Figure 3, in which condition the front wheels 33 preferably will have pneumatic tires, and it is thus unnecessary to load the machine completely on a truck.

In the modification shown in Figures 6 and 7, two

parallel cuts can be made using both blades 44 and 91, and it will be understood that the spacing of these cuts can be varied by a laterally adjustable mounting of either or both of these blades on their respective shafts. Blade 44 may be positioned on either end of shaft 23a, if desired, as indicated in dotted outline in Figure 7.

From the foregoing description it should be clear that my invention fulfills the above enumerated objects and has novel advantages, and it will be further understood that the foregoing is illustrative rather than restrictive of the invention, and that changes and modifications may be made without departing from the spirit and scope of the sub-joined claim.

I claim:

A concrete sawing machine, comprising: a frame; a front axle centrally pivotally secured to said frame so as to be rotatable about a vertically extendingaxis relative thereto; means for adjusting the angle of said axle relative to said frame; a pair of vertical guide tubes formed at the rear portion of said chassis; a rear axle; a pair of posts disposed within said tubes, said posts being secured to said rear axle at their lower ends; an upstanding tubular extension on said frame; a vertical shaft extending between said rear axle into said tubular extension; a compression spring encircling said vertical shaft; lock screw means carried by said tubes and engageable with said posts for adjusting their positions relative to said tube; rear wheels'carried by the outer ends of said rear axle; a transverse shaft journaled by the rear portion of said frame; a cutter disc carried by said axle outwardly of one of said rear wheels with the rearmost point of its periphery positioned rearwardly of the rearmost point of the periphery of said rear Wheels whereby said disc will normally trail said chassis but when the direction of movement thereof is reversed said disc will cut into a curb; a motor mounted upon said frame; power-transmitting means connecting said motor to said cutter disc; a fixed arcuate guard carried by said frame covering the front upper portion of said cutter disc; a movable arcuate guard carried by said frame normally covering the upper rear portion of said cutter disc but being removable from its normal position when said cutter disc is cutting into a curb; means on said frame for supplying a coolant to said cutter disc; handlebar means; and, mounting means on said frame engageable by said handlebar means for manually pushing said machine either forwardly or rearwardly over the surface of said concrete. 7

References Cited in the file of this patent UNITED STATES PATENTS 711,895 Hill Oct. 21, 1902 1,102,904 Gehrke July 7, 1914 2,244,742 Tyson June 10, 1941 2,468,336 -Lewis Apr. 26, 1949 

